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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b3a5df99066be744c3ddfd50b223a01208f566da9304bba799720a5876a447' 
  AND token = 'vSkcwecaoXM8XSyC0rCTbR6ISt0OLaqzVf8cg6cEWI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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