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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3afca6940d5f2687707ec594b3aa3b56f461d46a218eaafa969bf60565c59d' 
  AND token = 'fxeBqidg06PsH8r4gBxcNTm8imk00FfQfbu2pPb+rsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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