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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6633594442298df3ab1a5f1920623efae66885afb228b2e1d6373e29435d26da' 
  AND token = '4PAQvYE4GDVlJSI9+FK2Cg5treavII3D74Vnr++HoSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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