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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c16cac1c3abdeb022af0c6c795f57112541cb1d4c11a15046a36a9d8923e90' 
  AND token = 'YCk9pLXzeuHmca4ERpbXavptOit1n5/3Wpr9eFvnp8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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