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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9e21b77548e3b971a8e6ffa192969e54624b6ef0a87ad7eb9234bf36a590b9' 
  AND token = 'MNOkunbzR9loRw1xnPVr9aWRXoNSygLs2cCNtdyorcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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