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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '385df8c1dfd8044acab49e0c44d9468c9cef6eff7b5604fa0da00efa0c0b482e' 
  AND token = 'GkOZX+OgN7057ZYdsLwkhDllJ2supJpQttMFm5aDun4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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