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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd808cf4c2a18db4e09653e671bcd4562239809f474e424734f4787a51da8e35d' 
  AND token = 'bN4T1y5uiilNf7ccLo6ZMJH34ulXEs/MMQuSKHhuhqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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