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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4688c97aaed5f66e0d131ae5e0eeff2f8c3f12d6e9d687e441ac0c0752746ef5' 
  AND token = 'QkQ/9tvxNbSVtOPI1aafXhEiR5wluZjBQZSQ1t+lZQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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