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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97129103fc1a37b85a7995f28eccbb38d432b1c6c93c4bceade4d38f739c106' 
  AND token = 'Hll/HyCGJHdAV4u8kVl1HZM5LGZYaEKlzIyRo8JD6JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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