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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ac9f2ef0cbec4efb3cf46f4d9193079b87fefb1c14aac19022d2d8f8642d63' 
  AND token = 'Z+2UAeJcyMQD3ZSWgxOxDKAcJNgFpg0ZF6DXqzX+CWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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