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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4bc91d2dfa31a239d2363d200f9175775f5119f5bb0c068ec1ea133f7e2dee2' 
  AND token = 'Cbt+WhRka0NvEpCA1JrhNQRrb1gezLy8FTAChhipKq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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