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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58ed219ebdd1d81610faf8042d197593929e20d2a4e22d2feae76ee9921f6fd' 
  AND token = '3yF4FGd59c00FcYOSL3AMXlJvABJ2GVCkc2oHBv94mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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