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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f0dab18acf4e12999a65375551a9b276db24e2a75c7c56692d28af0341053f' 
  AND token = 'B/99rZHcIlECx/BG0sQDeZ85bGjdKGI11Kf171nlz0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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