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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe4bc1b1b6cc167c3b67ff7384a9426eb069d1c8e0638bd41d3b0351fc5e984' 
  AND token = 'bnsE9vz/NnH/zHts9T8cKS6VA+LvDJKAhdRiL0AIWgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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