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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1c113c3776d7ef94f03ae8a5cb53b6bae1383de6689ee65b425a1b6cc3fcca' 
  AND token = 'zEBsAoVmBG+93CpdvyB0onzIip1S+ka9Fadb9z3nPig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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