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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335d0066c83f17b13796bf123da76c3f62967adaa02dad15ed04ff93e2db2157' 
  AND token = 'zmoCTKd2ZGl5wEvGC4MHLmtQfNPrphaUsH9TUrlf7as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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