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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9ffa4e03f11bcbcb6addb283dd813e5ea080eaf7cba0d86d65dcc6f7b585a3' 
  AND token = 'mWMIDTvQM9bWEexHJd6Q43+25kVRpwVBKvgvMwGoi/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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