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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d62a9e54bfbbf52e297b30f8fbf439f208e27a1e350f2eae4238c71319b8ef7' 
  AND token = 'cyYY5zlZB+N46mCmCv2fElyDNjgVYMFmhUy007KJ0No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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