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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fea2ccb8d65647e7845a433f04c3fc00474e929756aca78b95c800f52b63e91' 
  AND token = 'tqZO4paYBJg1VInxWuE2k0JuNGBXI62kPti1DN1+7Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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