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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc2f733c20dee07285e7ac38864f5b3f0ca857ce12a364a6beb2b4e9d186663' 
  AND token = 'cLDcvrDORUE+KoNyB5RxP1YuEX3SLI+1s4wgCfQe3nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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