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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c4f90ae21dc1ba3525101fab401b5d6771b7cd9304f7490aefd5511297ecab0' 
  AND token = 'rWU9HMkL1UoDLieqzbwYxQgygVGgau5dltOcy/iyglc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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