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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0fd6d10f33fcae39c88bdecad372a194e85d8b72c926fd4d0f2cd29c71d3d0' 
  AND token = '2rEPrJjmyCh+ob4B4Plwxun9eLy3exQSim2NNyBgukQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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