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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c069d4f7fe454a45bbb5f75c70b699f32e09ebc114102a37e0fb8c9c0a27b7c' 
  AND token = 'I/5QhD3whzFEjid8CVk+3bI2ICpJqIWneY6z0sSL3l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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