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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9467a0aabd77ae196f9d6dff76c4bd99b3779dbb05916023b31a3dff1cae2bdd' 
  AND token = 'YW0rYF81f2vg05CeVR9euF4AVnn7HAotgO86Z4C/YUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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