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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d990e21a6242dafcf9c8b9b7784d42cfc87d64c34ca8f91aa0a8bca2709a874' 
  AND token = 'AvKUmcPOfxxgsVjZM1Mktr2LfoNeFeYkwizNZqjIFOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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