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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab79ea1e4e4d834ed6098ddf817e520d0fc863dc0d08b96593379de2c7b4dc6d' 
  AND token = 'o0Qnim5mXgQSQZr/cOfQP80a2oMx/szUeZXxQ41Bvzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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