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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ddbbf443bce9a2ff8738875f62ee4565d128762c7c6c2ef2c30034831131e8' 
  AND token = 'bhl4grfzr4uLLWvKS4VmGZcZEJ6RxomJVe7Nxf1i3zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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