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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f881db342026d73f3f5ebde0d92dd5eee46259f3bddef48640ed6b5118c358' 
  AND token = 'OLdzAGo13GI/rwrKz/ojNCupOFIF9Iwv6lHRmlfQVEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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