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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7c422c1064e6a240f8707c4073ae5b44d9d7d4107ae9432e41b2a726992b62' 
  AND token = 'skO8BuMCF0ETlk++mMzA+9E9hxOV+rnB8/vpfNx6lxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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