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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '185dc93b503d831a2bc71bb8f882b206ee789d79c11e812a2fa157f3a28b17f9' 
  AND token = '2h+je6al4sfYrgTw4WspIXOi7ug1fdQ/J0M9Sedvxgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}