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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566daa8735eb19719637dbf1a6de2bec800b0b52a5b7008b8f62eb1a89ef5b33' 
  AND token = 'XGaZMn0wlu5L62FUNqUvD6AiekMDTXD+MMset8UJC+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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