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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb63fd486bc740537fb6676c3fb12c4724e81ad67532e77dc1af47055224cf75' 
  AND token = 'u8n1hwgxC1k9TnAS9Vy12iI6hn9f0+zBPD/toffkw20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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