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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32343dac5da4e02d6a89a4deeebc1ec5ec611b96c93e9849d2cc1a9ea2c8f1e3' 
  AND token = 'gsbbTmSgOqxaWPqb1K/1Dk2OpUYPy5i2HT86u7xLpP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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