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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13bec73483cb65de8d6d93891dd82caf60dc49195e63e0b3d8e6cd712db276c' 
  AND token = 's5LNGRZaEH8id8trNOet4Qa3ugeneHWsRk1GHYTrt9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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