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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abaaf81dbc464c93a99c71b89ea92749c0234b0966f1c09fe244e24fac3fff97' 
  AND token = 'RWdC/lzZ2ccIgtUkOLRIRM6BTThhQvB1q7p4HmllcvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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