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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac0f1bd253e58118eb5300c4ea93cec49664bafccbbebff51e78712ae9b1a79' 
  AND token = 'xHce/DzzpEUWRRRrsw8UQ9fILCmVPZmIUgoSwKdW3u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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