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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7bfeeaee844883697a98be1071c309b6161d130d24f0b2b5fa57a6d6616ec85' 
  AND token = '0OubYrzm4FIG2ZSvTlK/Rqm8o0UsDvnAJIFXa7ToPcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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