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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0eb0cd0f171968bb8680467bf2ca700588b1d4229a92dd1b13232f486aa928' 
  AND token = '2xICFv2/F17sybNNIihvrvWhlT54dHhD7TqyXlLNMjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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