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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ef67ef4b7413574ac8a1d67fe34f5d2ef97d6b4695b132a9c069bb1afcb786' 
  AND token = 'p6vkE9plpTNR0uygn5pXAtsAcVIAeF5vjMvDYaC8moo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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