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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770efea50fff94a1d558ee5f258cdf9f76d0138cbd62629c81ae75d43d9638ff' 
  AND token = 'vAHWPLvwqc+skMkF1Rdx258JShLYhKFhRfsC3p+ZL0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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