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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d8e3f34de143fbf4703741a698ecb63cd6fc649cb8a713ba75489819857d1a8' 
  AND token = '+FKgYLw8P9zM3TRzTYeO2kizq4ae3bf5BCoEXE1sLhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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