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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd794f529e82df1cb9e922487c188573fa43be151036f55d0fdf7481a2775422' 
  AND token = '5JyH9a9uAXqjdjdEpWvjJKJ301pXWitkPEeosPKlsyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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