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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96bd861a2713ca8dbdd80d5148b00a507ed50de6ceb3d8023bebd12f2af0103' 
  AND token = 'wLHeP31ZG/VVW5+N39+ZSu+24Jc9dDzdag7oIJMT0Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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