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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cefb0de7488fa0f40a0aa8a179ec4833acd3734d5dd4ff08652482ce1d0e581' 
  AND token = 'iaVspsWpg8bByrVo5CzLRIud4rDwwdFEpzNCo1kSTmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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