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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c488fb2c70bec137fa63d4f5e2f5db82e1940d7dd95231eee0c9ea09a93bbe5' 
  AND token = '3vC1D0YWWNhkNmMMQTQ7WWeXGafly6V2p+CWSoxWAV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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