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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913996b45d89316085a752b94e5253d63e5f0fc60cb7d3a20103ce454711ed17' 
  AND token = 'EBBgbjLq9jA035/jdYVb88NBVOzjwr25nboBTa7Omc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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