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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2439db9431113f6529c3c9e716bf4b55c2347b66c3b1324b6a717f324d9874ac' 
  AND token = 'dWywYtIRwr7PbwnZ15LU7nfg7PrYjx+inWoyRxxpLlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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