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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f21d5aafec73e45c27c24699fa4d81c37aa0c80c6d9d7a7cdc6c53da8ca4db1' 
  AND token = '1gkkpPGI3No3wS4u3jd4rKDPMTrpM5vHPuXK9qctycQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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