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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a397fa979bb9a6ca08116965c2d724e41d5cb233bd77653b67c2b8f636a0dd13' 
  AND token = 'o1+/ps8HyQyxItHVs4U58kar68TbdrnVrN8NsgqdV3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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