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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062062db14ad1217ec9e0fef1721d87a8f5b286845cec6cf5b01d9d2fc597ee6' 
  AND token = 'w8EzDs3f9PvOAb5PAS+gmhW3PEgI9Ab+ZuICrQYa6b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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