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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05686141b757aae021f1acb5896445ddc1a52a9a505e7173d3cc39e338e34874' 
  AND token = 'ZcEfVer5Vgmf5bXyIxEOuxM2q/67q7QTqK8nYUwPPuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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