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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc25e7ccfc9fc3e3b210f0ada95fb3e2fcbe9d5bf70318cd431516b4131dec29' 
  AND token = 'Vg7zVtXftkyVZRVQx01vQ/ztv4bfB2C86o96tSU+aoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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