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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8a2e0bb7de927f09760f8623ed4a7768ed47fd94e1e30e36aeb10fef5014ef' 
  AND token = 'OUvzrRBe2JWdK/SFNEkff5lQyhDUBYcIHK1Kxe2KDEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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