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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f316bc39106ecd198609a0dd654ccf91b6de3f02ba6506a79fb0d82b6db5089' 
  AND token = '4j3ovKtNnYN/Uy0pYSABXrLLShriRTPjuuXNe7ZGEoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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