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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bfbfbf891cfbac749958a49a7eae9b8124f2402995013c8ea4a0c8216c82b1a' 
  AND token = 'V2qnobi59p0mDqa6893Lhw/usSCWP0VxK8BqSiTfFVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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