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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd103bbc87f4bd9c17c8320ad14e6f072f214423ce10e439f1f133a8059615a5d' 
  AND token = '1Z0qn5ANUNG8xLRk+UireEUlnn1yUchSaNcepdrESWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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