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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b0bd80bbef42fe6f73ac19798cc4f015873a6c95a19c67d5ab18e262363057' 
  AND token = '9eJCoZFiolKcukM2KUkxkBmiHVRCdRdS4PUnczDnY6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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