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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ecf1ef006faed36c09de63756cc380f60aaa6ee580c050cdf58ee965d9936f' 
  AND token = 'hCY2b6r84JNTlJEMdvEFjLj92t/mseHSsJ4Ov59PPmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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